Isomeric 3-or 4-chlorotriptycene-7-carboxylic acid was synthesized from sodium anthraquinone-β-sulfonate and resolved with quinidine methohydroxide. The absolute configurations of (−)-3-chloro-and (−)-4-chlorotriptycene-7-carboxylic acids could be determined to be 1S, 6S and 1S, 6R, respectively, by the chemical correlation with (+)-2, 5- dimethoxy-8-chlorotriptycene whose absolute configuration was proved to be 1R, 6S by X- ...
